Anyone?!!!

I'm at my wits end. This morning I knew she would poo as she had been farting a lot. I took her to the potty with a book for 10 mins - wee but no poo, and she said there was none coming. Got her dressed again and she went to the playroom while I had breakfast. Every minute or so I called out asking if she needed to do or had done poos - 'No' was the answer every time. After 5 mins or so I went in there and what do you know - poo in her undies!